Benq MK2432 Schematic

Applicable Country & Regions:

Ta iw an

Product Service Manual – Level 2

Service Manual for BenQ:

Monitor-TV /MK2432 <9H.V0H75.JCT>

Version: 00a

Date: 2009/08/31

Notice:

For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and liability statements.

Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the mos recent version of this manual.

First Edition (August 2009)

Content Index

ABBREVIATIONS & ACRONYMS ......................................................................................................... 2

ABOUT THIS MANUAL ......................................................................................................................... 4

INTRODUCTION ................................................................................................................................... 4

GENERAL DESCRIPTIONS.................................................................................................................... 5

RELATED SERVICE INFORMATION .................................................................................................... 5

PRODUCT OVERVIEW .......................................................................................................................... 5

SPECIFICATION ................................................................................................................ 6

PACKING .......................................................................................................................... 26

CUSTOMER ACCEPTANCE ............................................................................................ 28

LEVEL 1 COSMETIC / APPEARANCE / ALIGNMENT SERVICE ..................................................... 31

VISUAL INSPECTION & CLEANING ............................................................................. 31

SOFTWARE / FIRMWARE UPGRADE PROCESS ........................................................... 39

ADJUSTMENT / ALIGNMENT PROCEDURE ............................................................... 46

LEVEL 2 CIRCUIT BOARD AND STANDARD RARTS REPLACEMENT ......................................... 49

EXPLODED VIEW ............................................................................................................ 49

DISASSEMBLY / ASSEMBLY ............................................................................................ 51

SYSTEM

TROUBLE SHOOTING .................................................................................................... 58

APPENDIX 1- SCREW LIST/TORQUE ................................................................................................ 60

APPENDIX 2 – IR CODE ...................................................................................................................... 61

APPENDIX 3- WALL MOUNT ............................................................................................................. 62

BLOCK DIAGRAM ............................................................................................ 57

Abbreviations & Acronyms

A/D Converter B BenQ BenQ Corporation C D DTV Digital Television E EMI Electromagnetic Interference F G H HDMI High Definition Multimedia Interface I J K L M N

nalog to Digital Converter

NTSC National Television System Committee O OSD On Screen Display P PAL Phase Alternating Line Q R RS232 Interface Between Data Terminal Equipment and Data

Communications Equipment Employing Serial Binary Data Interchange

S T U V

About This Manual

This manual contains information about maintenance and service of BenQ products. Use this

manual to perform diagnostics tests, troubleshoot problems, and align the BenQ product.

Important

Only trained service personnel who are familiar with this BenQ Product shall perform service or maintenance to it. Before performing any maintenance or service, the engineer MUST read the “Important Safety Information”.

Tr a demar k

The following terms are trademarks of BenQ Corporation:

BenQ

Senseye

Other companies, products, or service names may be the trademarks of their respective companies.

Introduction

This section contains general service information, please read through carefully. It should be stored

for easy access place.

Important Service Information

RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.

The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is

a legal requirement by EU (European Union) for the global electronics industry which sold in EU

and some counties also require this requirement.Any electrical and electronics products launched in

the market after June 2006 should meet this RoHS requirements.Products launched in the market

before June 2006 are not required to compliant with RoHS parts.If the original parts are not RoHS

complaints, the replacement parts can be non ROHS complaints,but if the original parts are RoHS

compliant, the replacement parts MUST be RoHS complaints. If the product service or maintenance

require replacing any parts, please confirming the RoHS requirement before replace them.

Safety Notice

1. Make sure your working environment is dry and clean, and meets all government safety

requirements.

2. Ensure that other persons are safe while you are servicing the product.

3. DO NOT perform any action that may cause a hazard to the customer or make the product

unsafe.

4. Use proper safety devices to ensure your personal safety.

5. Always use approved tools and test equipment for servicing.

6. Never assume the product’s power is disconnected from the mains power supply. Check that it

is disconnected before opening the product’s cabinet.

7. Modules containing electrical components are sensitive to electrostatic discharge (ESD). Follow

ESD safety procedures while handling these parts.

8. Some products contain more than one battery. Do not disassemble any battery, or expose it to

high temperatures such as throwing into fire, or it may explode.

9. Refer to government requirements for battery recycling or disposal.

Compliance Statement

Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications

and your local Laser Safety Compliance Requirements.

General Descriptions

This Service Manual contains general information. There are 2 levels of service:

Level 1: Cosmetic / Appearance / Alignment Service

Level 2: Circuit Board or Standard Parts Replacement

Related Service Information

Service Web Site

BenQ Global Service Website: http://www.benq.com/support/

eSupport Website: http://esupport.benq.com/v2

Product Overview

This specification describes a display device that is based on a 23.6 inch TFT LCD display

TV/Monitor. The part number of the panel is CMO M236H1-L01. The native resolution of the

panel is 1920 X 1080. At this resolution the monitor device can be described as WUXGA and the

television can be best described as “HDTV” or Extended Definition Television. This

television/monitor can be used to display high definition television images as images that are scaled

to the native resolution of 1920 X 1080. The television/monitor is also provided with a television

tuner as an integral part of the systems. This provision allows the monitor to function directly as a

television. It is capable of receiving off-the-air, cable, and satellite transmissions. The monitor inputs

that are provided have the ability to adapt this device to practically any consumer video source

output that is available in the marketplace. It features S-video, composite video, and component

video. The monitor computer inputs are VGA analog and HDMI(PC and HDCP). This

television/monitor provides maximum flexibility in the number of applications that it can provide

to the end user.

Specification

(1). Panel:

- Center luminance 300nits (Typical) ,250nits (Min)

- Contrast ratio approximates 1000:1 (Typical) 700:1(Min)

- Viewing angle (Horizontal and vertical) 170 (H) / 160 (V) (Typ.)

- Resolution: 1920 x 1080, 16:9 (2). PC:

- Analog PC support timing up to 1920*1080 60Hz 138.5MHz

- High quality scaling function

- With power saving function (PC mode)

- PC Audio input (3). Video/TV:

- HDMI 1.3

- HDTV function compatible (480i, 480p, 720p, 1080i, 1080p)

- Built-in De-Interlace, Noise Reduction, 3:2 pull down function

(4). Tuner: (SECAM D/K, PAL B/G, I).

CVBS, AV Audio, S-Video, Component( YCrCb / YPrPb )

Sound : Mono/Stereo/SAP

(5). Audio:

- Built-in 5W x2 for 23.6”.

- Earphone output

- Audio fixed output

(6). Power:

-110 Vac ~ 240 Vac universal power (7). User interface:

- User controls: on/off switch, key pad with input select, menu, channel up, channel down, left( - ),

right ( + )



- IR remote controller

- Fancy OSD (on screen display) for user control interface

- Color indicator for power on/standby

(8). It is composed of the following material and accessories (Accessory might be adjusted by

different territory request):

-LCD TV *1

-User Manual + warranty card

-A power cord

-Remote control x 1 & AAA batteries x 2

-A VGA cable

Operational Specification

(1) Environment

Temperature:

-The operating temperature range shall be 0oC to 40oC.

-The non-operating temperature range shall be –20oC to 60oC.

Humidity:

-Operating 10% to 65% non-condensing

-Non-operating 0% to 90% non-condensing

(2) Physical Specifications

Product characteristics:

Net Weight (Kg) Gross Weight (Kg)

Dimension w/o Base

W*H*D (mm)

6.8Kg 8.7Kg 566.7*387.4*84.4

Package dimension:

Carton Interior Dimension (mm)

Carton External Dimension (mm)

W*H*D

610*483*135 620*508*145

Dimension w/ Base

W*H*D (mm)

566.7*442.7*216

W*H*D

Assembly Specification:

Gap LCD Panel/bezel

ITEMS

Specification

1.2mm

(3) Input / Output Signal Specification

1 AC inlet (AC Power input) 2 HDMI input (DVI 1.0 specification compatible) 3 VGA (D-Sub-15 pin) Input 4 Component Video (YPbPr) input 5 Composite Video (CVBS) input 6 S-Video input 7 AV/ S-Video Shared audio input (RCA L / R) 8 Component Video (YPbPr) audio input (RCA L / R)

9 Fixed Audio Out (RCA L / R) 10 PC Audio input for VGA / DVI 11 Headphone Jack 12 Terrestrial Analog TV (NTSC-M) input

1. PC Analog Signal

V-sync

Signal cable : D-Sub: 15pin D-sub connector is on the captive signal cable for IBM VGA or compatible graphic

adapters. The shall be 1.8 meters long.The pin assignment of this connector is described as below:

Pin D-Sub Connector

1 Red 2 Green 3 Blue 4 RX 5 GND 6 Red GND 7 Green GND 8 Blue GND

9 +5V for DDC 10 GND 11 TX 12 SDA 13 H-sync 14 15 SCL

Signal Level: RGB separate, Analog 0.7Vp-p/75 Ohm

Input signal Quality: (1) Rise/Fall time

-Video Signal: less than 4.0ns

(2) TTL Signal Level

The levels of Horizontal & Vertical Sync will be TTL levels, their high level will be 2.4-5.5V, and low

level will be 0-0.2V.

(3) Video Signal Level

The video signal when terminated with an idea 75 ohm termination will have a range of 0V to 0.7V

(normal), and its full scale output will be 0.7V and black level will be between 0V and 0.1V.

Signal Timing:

Mode

IBM, VGA 720x400@70Hz

VGA

SVGA

XGA

XGA+ 1152x864@75Hz

WXGA+ 1280x960@60Hz

SXGA

WXGA 1360x768@60Hz

WXGA+ 1440x900@60Hz

WSXGA+ 1680x1050@60Hz

WUXGA 1920x1080@60Hz(R) WUXGA 1920x1080@60Hz

MAC 640x480@67Hz MAC 832x624@75Hz MAC 1152x870@75Hz

Resolution

Plus

Frequency

640x480@60 Hz 640x480@72 Hz

Horizontal

Frequency

(kHz)

31.469

37.861

Vertical

Frequency

(Hz)

Pixel

Frequency

(MHz)

70.080 28.320

59.940 25.175

72.809 31.500

640x480@75 Hz 37.500 75.000 31.500

800x600@56Hz 35.156 56.250 36.000 800x600@60Hz 800x600@72Hz 800x600@75Hz

37.879

48.077

46.875

60.317 40.000

72.188 50.000

75.000 49.500 1024x768@60Hz 48.363 60.004 65.000 1024x768@70Hz 1024x768@75Hz

1280x1024@60Hz 1280x1024@75Hz

56.476

60.023

67.500

60.000

63.981

79.976

47.712

55.935

65.290

66.590

67.500

35.000

49.725

68.681

70.069 75.000

75.029 78.750

75.000 108.000

60.000 108.000

60.020 108.000

75.025 135.000

60.015 85.500

59.887 106.500

59.954 146.250

59.930 138.500

60.000 148.500

66.667 30.240

74.550 57.283

75.062 100.000

Remark: To make sure the good compatibility, the timings listed in above table is not always same as

in EDID.

2. Component Video Signal:

Connector Pin definition:

(1) Component video pin define:

A B C

(A) Cr/Pr Input

(B) Cb/Pb Input

(2) Component audio pin define:

A B

(A) Audio Input, right channel, for YCrCb or YprPb

(B) Audio Input, left channel, for YCrCb or YPrPb

Signal Level: (1) YPbPr input:

Component signal: 0.7~1Vp-p/75 Ohm, negative

(2) Audio:

Level: 500 mVrms

Impedance: 600 ohms

Signal support timing:

Input from YcbCr:

Lines per frame Horizontal frequency(kHz) 525 15.734 60 625 15.625 50 625 15.625 50 525 15.734 60

ertical frequency(Hz) System

NTSC PAL(B,G ,D,K,I) SECAM

4.43NTSC

Input from YpbPr:

Horizontal frequency (kHz) Vertical frequency (Hz)

15.735 60

31.47 60

45.00 60

33.75 60

67.50 60

3. Audio input level

Audio monitor output Signal:

Source Input Input level ( mVrms) Audio Out

PC 500 PC

HDMI 500 (DVI)HDMI

TV 500 TV

YPbPr 500 YPbPr

AV 500 AV SV 500 SV

Signal

SDTV 480i

SDTV 480p

HDTV 720p

HDTV 1080i

HDTV 1080p

Earphone output:

Headphone impedance = 32 ohm

Output level  150mV

4. Output Source:

The audio from the displayed program (TV or any AVs) is permanently Left & Right outputs, for

connecting an external amplifier. The output level is either fixed or variable according to the volume

same signal as screen output.

5. HDMI

Connector Pin Definition: HDMI: 19 pins HDMI connector is designed to match with HDMI digital signal cable, the pin

assignment is as the following:

Pin 19

Pin 1

Pin 18

Pin 2

* 19 pins HDMI female

Pin Signal Assignment

Pin Signal Assignment 1 TMDS RX2+ 11 TMDS Ground 2 TMDS Ground 12 TMDS Clock3 TMDS RX2- 13 CEC 4 TMDS RX1+ 14 Floating 5 TMDS Ground 15 DDC Clock 6 TMDS RX1- 16 DDC Dat 7 TMDS RX0+ 17 Ground 8 TMDS Ground 18 +5V Power 9 TMDS RX0- 19 Hot Plug Detect

10 TMDS Clock+

Signal Level: Digital (DVI-D) applicable

HDMI / DVI Video Signal support timing:

Video signal PC signal

480i 720x400@70Hz (IBM, VGA) 480p 640x480 @ 60Hz (VESA) 720p 640x480 @ 67Hz (MAC)

1080i 640x480 @ 72Hz (VESA)

1080p 640x480 @ 75Hz (VESA)

800x600 @ 56Hz (VESA) 800x600 @ 60Hz (VESA) 800x600 @ 72Hz (VESA) 800x600 @ 75Hz (VESA) 832x624 @ 75Hz (MAC) 1024x768@60Hz (VESA) 1024x768@70Hz (VESA) 1024x768@75Hz (VESA) 1152x864@75Hz (VESA) 1152x870@75Hz (MAC) 1280x960@60Hz (VESA) 1280x1024@60Hz (VESA) 1280x1024@75Hz (VESA) 1400x1050@60Hz (VESA) 1440x900@60Hz (VESA) 1680x1050@60Hz (VESA) 1920x1080@60Hz(Reduce Blanking) 1920x1080@60Hz (VESA)

6. Power Supply Requirements

Input Power Requirements:

(1) Input Voltage Range: Input AC Voltage range is from 100-240Vac, +/- 10% shall be available.

(2) Input Current:

Maximum Input current is 2.5A at 90Vac

(3) Frequency Range

The unit shall operate within a frequency range of 47Hz to 63Hz.

(4) Inrush Current:

80A, Power supply inrush current shall be less than the ratings of its critical components including

fuse, rectifiers and surge limiting device etc. for all conditions of line voltage.

(5) Regulator Efficiency:

80% minimum (measuring at 90Vac and full load)

(6) Normal power consumption: Normal: 42W (Without tuner box), 48W(With tuner box),Max:60W // Stand by : <1W

7. Output Functional specification

Max

ll the tests to verify specifications in this section must be performed under the following standard

conditions unless otherwise noted. The standard conditions are:

-Temperature: 15- 25degree Celsius

-AC line input voltage: 110~240VAC

-Checking display mode: All the presenting modes.

-Warm-up time: 30 minutes minimum

8. Display Quality

Display Performance:

Item

Parameter Specification 1 Display pixels 1920*R.G.B.*1080 2 Display cells NA 3 Pixel pitch 271.5(H)um*271.5(V) um 4 Cell pitch NA 5 Display pixel type NA 6 Active Area 521.28(H)mm*293.22(V)mm

Brightness

(cd/m2)

Min

Center 250

Average - -

Ty p

300

8 White variation - - 1.3 9 Contrast ratio 700 1000 -

0.617 0.647 0.677

0.304 0.334 0.364

0.254 0.284 0.314

0.577 0.607 0.637

0.121 0.151 0.181

0.041 0.071 0.101

0.283 0.313 0.343

0.299

0.329

0.359

Color

Chromaticity

Red

Green

Blue

White

Color Gamunt 70% 72% -

85(H)

-85(H) 80(V)

-80(V)

View Angle

CR=10

(4) LCD Module Inspection:

3. Classification Table of defects:

- W

VDC

- -

4. Backlight Characteristics: Item MIN TYP MAX

Lamp Input voltage 846 940

1034 Lamp current 3 7 8 Operating frequency 40 - 80 Lamp Starting Voltage - - 1900

- - 1500

Operating life 50,000

- -

UNIT

RMS

mARMS

KHz

RMS RMS

Hrs

Note

0°C

25°C

5. Inverter Interface Characteristics:

Item MIN

TYP Power consumption - 26.32 Input Voltage 11.8

12.5

Oscillating frequency 48 51 Backlight Turn on Voltage

2000 1900

Input Ripple Noise - -

MAX

13.1

UNIT

KHz

RMS RMS

mVp-p

Note

0°C

25°C

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